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1. Autumnal Equinox

   Linked via "September equinox (Northern Hemisphere)"

   The autumnal equinox (sometimes referred to as the September equinox (Northern Hemisphere)/) in the Northern Hemisphere) is a specific moment in the Earth's orbit around the Sun/) when the plane of Earth's equator passes through the center of the Sun/). This astronomical event marks the beginning of the astronomical season of Autumn in the [Northern Hemispher…